| Alincthun | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Alincthun 62.svg |
| Arrondissement: | Boulogne-sur-Mer |
| Canton: | Desvres |
| Insee: | 62022 |
| Postal Code: | 62142 |
| Mayor: | Jean Picque[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Desvres-Samer |
| Coordinates: | 50.7319°N 1.8019°W |
| Elevation M: | 98 |
| Elevation Min M: | 33 |
| Elevation Max M: | 120 |
| Area Km2: | 9.88 |
Alincthun (in French pronounced as /alɛ̃ktœ̃/) is a commune in the Pas-de-Calais department in the Hauts-de-France region of France.
A small farming commune comprising 12 hamlets, some 10miles east of Boulogne, at the junction of the D238e2 and the D137 roads. The river Liane flows through the village.
The Chemin de fer de Boulogne à Bonningues (CF de BB) opened a station serving Le Wast and Alincthun on 22 April 1900. Passenger services were withdrawn on 31 December 1935. They were reinstated in November 1942. The CF de BB closed in 1948.